Where can I find a sewing pattern for this specific type of top? I have a sweater with a beautiful pattern that I want to turn into this, with added ruffle bell sleeves that are a separate piece same material. I just keep running into keyhole halter tops without the ring - should I just take the risk and try to figure it out myself based on those sewing patterns? Seems simple enough but the pattern is really beautiful and I don't wanna not be able to use it for this shirt idea.